mirror of https://github.com/python/cpython
503 lines
10 KiB
C
503 lines
10 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Module support implementation */
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#include "Python.h"
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#ifdef MPW /* MPW pushes 'extended' for float and double types with varargs */
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typedef extended va_double;
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#else
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typedef double va_double;
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#endif
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/* Package context -- the full module name for package imports */
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char *_Py_PackageContext = NULL;
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/* Py_InitModule4() parameters:
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- name is the module name
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- methods is the list of top-level functions
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- doc is the documentation string
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- passthrough is passed as self to functions defined in the module
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- api_version is the value of PYTHON_API_VERSION at the time the
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module was compiled
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Return value is a borrowed reference to the module object; or NULL
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if an error occurred (in Python 1.4 and before, errors were fatal).
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Errors may still leak memory.
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*/
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static char api_version_warning[] =
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"WARNING: Python C API version mismatch for module %s:\n\
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This Python has API version %d, module %s has version %d.\n";
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PyObject *
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Py_InitModule4(name, methods, doc, passthrough, module_api_version)
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char *name;
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PyMethodDef *methods;
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char *doc;
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PyObject *passthrough;
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int module_api_version;
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{
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PyObject *m, *d, *v;
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PyMethodDef *ml;
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if (module_api_version != PYTHON_API_VERSION)
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fprintf(stderr, api_version_warning,
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name, PYTHON_API_VERSION, name, module_api_version);
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if (_Py_PackageContext != NULL) {
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char *p = strrchr(_Py_PackageContext, '.');
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if (p != NULL && strcmp(name, p+1) == 0) {
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name = _Py_PackageContext;
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_Py_PackageContext = NULL;
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}
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}
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if ((m = PyImport_AddModule(name)) == NULL)
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return NULL;
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d = PyModule_GetDict(m);
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for (ml = methods; ml->ml_name != NULL; ml++) {
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v = PyCFunction_New(ml, passthrough);
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if (v == NULL)
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return NULL;
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if (PyDict_SetItemString(d, ml->ml_name, v) != 0)
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return NULL;
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Py_DECREF(v);
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}
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if (doc != NULL) {
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v = PyString_FromString(doc);
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if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0)
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return NULL;
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Py_DECREF(v);
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}
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return m;
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}
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/* Helper for mkvalue() to scan the length of a format */
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static int countformat Py_PROTO((char *format, int endchar));
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static int countformat(format, endchar)
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char *format;
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int endchar;
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{
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int count = 0;
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int level = 0;
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while (level > 0 || *format != endchar) {
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switch (*format) {
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case '\0':
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/* Premature end */
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PyErr_SetString(PyExc_SystemError,
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"unmatched paren in format");
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return -1;
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case '(':
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case '[':
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case '{':
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if (level == 0)
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count++;
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level++;
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break;
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case ')':
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case ']':
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case '}':
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level--;
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break;
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case '#':
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case '&':
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case ',':
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case ':':
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case ' ':
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case '\t':
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break;
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default:
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if (level == 0)
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count++;
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}
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format++;
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}
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return count;
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}
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/* Generic function to create a value -- the inverse of getargs() */
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/* After an original idea and first implementation by Steven Miale */
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static PyObject *do_mktuple Py_PROTO((char**, va_list *, int, int));
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static PyObject *do_mklist Py_PROTO((char**, va_list *, int, int));
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static PyObject *do_mkdict Py_PROTO((char**, va_list *, int, int));
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static PyObject *do_mkvalue Py_PROTO((char**, va_list *));
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static PyObject *
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do_mkdict(p_format, p_va, endchar, n)
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char **p_format;
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va_list *p_va;
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int endchar;
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int n;
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{
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PyObject *d;
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int i;
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if (n < 0)
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return NULL;
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if ((d = PyDict_New()) == NULL)
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return NULL;
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for (i = 0; i < n; i+= 2) {
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PyObject *k, *v;
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int err;
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k = do_mkvalue(p_format, p_va);
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if (k == NULL) {
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Py_DECREF(d);
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return NULL;
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}
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v = do_mkvalue(p_format, p_va);
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if (v == NULL) {
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Py_DECREF(k);
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Py_DECREF(d);
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return NULL;
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}
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err = PyDict_SetItem(d, k, v);
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Py_DECREF(k);
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Py_DECREF(v);
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if (err < 0) {
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Py_DECREF(d);
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return NULL;
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}
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}
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if (d != NULL && **p_format != endchar) {
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Py_DECREF(d);
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d = NULL;
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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}
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else if (endchar)
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++*p_format;
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return d;
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}
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static PyObject *
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do_mklist(p_format, p_va, endchar, n)
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char **p_format;
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va_list *p_va;
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int endchar;
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int n;
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{
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PyObject *v;
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int i;
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if (n < 0)
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return NULL;
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if ((v = PyList_New(n)) == NULL)
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return NULL;
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for (i = 0; i < n; i++) {
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PyObject *w = do_mkvalue(p_format, p_va);
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if (w == NULL) {
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Py_DECREF(v);
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return NULL;
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}
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PyList_SetItem(v, i, w);
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}
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if (v != NULL && **p_format != endchar) {
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Py_DECREF(v);
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v = NULL;
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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}
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else if (endchar)
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++*p_format;
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return v;
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}
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static PyObject *
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do_mktuple(p_format, p_va, endchar, n)
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char **p_format;
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va_list *p_va;
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int endchar;
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int n;
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{
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PyObject *v;
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int i;
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if (n < 0)
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return NULL;
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if ((v = PyTuple_New(n)) == NULL)
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return NULL;
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for (i = 0; i < n; i++) {
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PyObject *w = do_mkvalue(p_format, p_va);
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if (w == NULL) {
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Py_DECREF(v);
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return NULL;
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}
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PyTuple_SetItem(v, i, w);
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}
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if (v != NULL && **p_format != endchar) {
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Py_DECREF(v);
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v = NULL;
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PyErr_SetString(PyExc_SystemError,
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"Unmatched paren in format");
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}
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else if (endchar)
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++*p_format;
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return v;
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}
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static PyObject *
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do_mkvalue(p_format, p_va)
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char **p_format;
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va_list *p_va;
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{
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for (;;) {
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switch (*(*p_format)++) {
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case '(':
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return do_mktuple(p_format, p_va, ')',
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countformat(*p_format, ')'));
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case '[':
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return do_mklist(p_format, p_va, ']',
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countformat(*p_format, ']'));
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case '{':
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return do_mkdict(p_format, p_va, '}',
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countformat(*p_format, '}'));
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case 'b':
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case 'h':
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case 'i':
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return PyInt_FromLong((long)va_arg(*p_va, int));
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case 'l':
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return PyInt_FromLong((long)va_arg(*p_va, long));
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#if HAVE_LONG_LONG
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case 'L':
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return PyLong_FromLongLong((long long)va_arg(*p_va, long long));
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#endif
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case 'f':
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case 'd':
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return PyFloat_FromDouble(
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(double)va_arg(*p_va, va_double));
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case 'c':
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{
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char p[1];
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p[0] = va_arg(*p_va, int);
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return PyString_FromStringAndSize(p, 1);
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}
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case 's':
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case 'z':
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{
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PyObject *v;
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char *str = va_arg(*p_va, char *);
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int n;
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if (**p_format == '#') {
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++*p_format;
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n = va_arg(*p_va, int);
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}
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else
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n = -1;
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if (str == NULL) {
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v = Py_None;
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Py_INCREF(v);
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}
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else {
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if (n < 0)
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n = strlen(str);
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v = PyString_FromStringAndSize(str, n);
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}
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return v;
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}
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case 'S':
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case 'O':
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if (**p_format == '&') {
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typedef PyObject *(*converter) Py_PROTO((void *));
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converter func = va_arg(*p_va, converter);
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void *arg = va_arg(*p_va, void *);
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++*p_format;
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return (*func)(arg);
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}
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else {
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PyObject *v;
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v = va_arg(*p_va, PyObject *);
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if (v != NULL)
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Py_INCREF(v);
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else if (!PyErr_Occurred())
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/* If a NULL was passed
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* because a call that should
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* have constructed a value
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* failed, that's OK, and we
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* pass the error on; but if
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* no error occurred it's not
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* clear that the caller knew
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* what she was doing. */
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PyErr_SetString(PyExc_SystemError,
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"NULL object passed to Py_BuildValue");
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return v;
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}
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case ':':
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case ',':
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case ' ':
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case '\t':
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break;
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default:
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PyErr_SetString(PyExc_SystemError,
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"bad format char passed to Py_BuildValue");
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return NULL;
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}
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}
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}
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#ifdef HAVE_STDARG_PROTOTYPES
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/* VARARGS 2 */
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PyObject *Py_BuildValue(char *format, ...)
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#else
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/* VARARGS */
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PyObject *Py_BuildValue(va_alist) va_dcl
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#endif
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{
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va_list va;
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PyObject* retval;
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#ifdef HAVE_STDARG_PROTOTYPES
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va_start(va, format);
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#else
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char *format;
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va_start(va);
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format = va_arg(va, char *);
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#endif
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retval = Py_VaBuildValue(format, va);
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va_end(va);
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return retval;
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}
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PyObject *
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Py_VaBuildValue(format, va)
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char *format;
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va_list va;
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{
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char *f = format;
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int n = countformat(f, '\0');
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va_list lva;
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#ifdef VA_LIST_IS_ARRAY
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memcpy(lva, va, sizeof(va_list));
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#else
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lva = va;
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#endif
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if (n < 0)
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return NULL;
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if (n == 0) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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if (n == 1)
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return do_mkvalue(&f, &lva);
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return do_mktuple(&f, &lva, '\0', n);
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}
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#ifdef HAVE_STDARG_PROTOTYPES
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PyObject *
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PyEval_CallFunction(PyObject *obj, char *format, ...)
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#else
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PyObject *
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PyEval_CallFunction(obj, format, va_alist)
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PyObject *obj;
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char *format;
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va_dcl
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#endif
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{
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va_list vargs;
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PyObject *args;
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PyObject *res;
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#ifdef HAVE_STDARG_PROTOTYPES
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va_start(vargs, format);
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#else
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va_start(vargs);
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#endif
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args = Py_VaBuildValue(format, vargs);
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va_end(vargs);
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if (args == NULL)
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return NULL;
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res = PyEval_CallObject(obj, args);
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Py_DECREF(args);
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return res;
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}
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#ifdef HAVE_STDARG_PROTOTYPES
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PyObject *
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PyEval_CallMethod(PyObject *obj, char *methodname, char *format, ...)
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#else
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PyObject *
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PyEval_CallMethod(obj, methodname, format, va_alist)
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PyObject *obj;
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char *methodname;
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char *format;
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va_dcl
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#endif
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{
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va_list vargs;
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PyObject *meth;
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PyObject *args;
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PyObject *res;
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meth = PyObject_GetAttrString(obj, methodname);
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if (meth == NULL)
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return NULL;
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#ifdef HAVE_STDARG_PROTOTYPES
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va_start(vargs, format);
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#else
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va_start(vargs);
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#endif
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args = Py_VaBuildValue(format, vargs);
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va_end(vargs);
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if (args == NULL) {
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Py_DECREF(meth);
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return NULL;
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}
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res = PyEval_CallObject(meth, args);
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Py_DECREF(meth);
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Py_DECREF(args);
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return res;
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}
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